Air compressor



A. Y. DODGE AIR COMPRESSOR Dec. 13, 1932.

Filed OC't. 18, 1928 Patented has. is, iesa 3,391

ABEL Y. DGDGE, 01" SOUTH BEND, INDIANA are cor-arnnsson Applicationfiled October 18, 1928. Serial No. 813,213.

My invention relates to air compressors. in its upper position fluidwill be supplied to One of the objects of my invention is to the cran icase chamber at substantially the increase the capacity of a compressorwithout ame P es re as eXlStS in the manifold. As

increasing the "cost materially. the piston moves downward the inletport 8 V 5 A further ob ect is to increase the thermal 1s almostimmediately cut ofi' from the fluid 55 cfiiciency of a compressor.supply port and thereafter the fluid is com- A further object is toprovidea compressor pressed in a crank case chamber until the which willbe particularly advantageous in p n e c es I s lowermost position, as

refrigeration systems. shown in Fig. 2. During this downward Fu th bj till appear f th d m vement of the piston fluid has been supscription andl im, plied to the cylinder above the piston past In the drawing, inwhich an mb di t. the lightly held inlet valve 2 so that just of myinventio i h n, before the piston uncovers the port the res- Fig. 1 i averti al ti th h an i sure in the cylinder above the piston will be 15compressor; and substantially that in the manifold 10.

h Fig. 2 is a section of part of the cylinder AS 500D, Q a t e pistonuncovers n the same plane as that of Fig. 1 but showh p t 13 f theConnecting passe e 9 fluid mg th pi ton in it lowermost iti Wlll rushfrom the crank case cham or to the In carrying ut my i ti 1 tili d thcylinder above the piston until the pressure is go crank case of thcompressor 35 e preoomequalized. Shortly thereafter the piston bepressorcha ber, gins its upward movement and the precom- Referring to the d i id t il, th pressed fluid above the piston is forced out struction showntherein comprises a cylinder P the eXhiHlSt Valve 3 into any Suitable 1having inlet valve 2 and outlet valve 3, a rv ir r compressed fluidsystem, the inas piston 4 operating in said cylinder 1, a conlet ve 2acting as a check or nonreturn necting rod 5 for operating said piston,a Valve ring his movement. crank 6 for actuating the connecting rod, a tWill be noted that the inlet port l to the fluid-tight crank case 7 forthe crank 6, a cy inder and he inle port 8 to the crank port 8 forsupplying fluid to th ra k case case are both connected with the samemaniso chamber to be precompressed therein. a pasfold sage 9 for thefluid from the crank case cham- This Construction is of specialadvantage her to the cylinder above the-piston and a in certain types ofrefrigeration systems in manifold 10 for supplying fluid both to thewhich the fluid to be compressed must be in cylinder above thepiston andto the crank a closed system.

as case chamber below the piston. While I have shown but one form of myThe inlet valve has a light spring 11 which invention, various otherforms will occur to will allow the valve 2 to op n easily t ad it thoseskilled in the art and consequently this fluid above the piston as thpiston mov s invention is to be limited only by the scope d dl Th h tValve 3 i pro of the appended claim and the prior art.

4% vided with a light spring 12 which permits I Claim! the fluid to beexhausted past it as the piston A fluid compressor, comprising acylinder, moves upward. The inlet port 8 to the crank a piston operatingin said cylinder, a connectcase is so positioned that it is closedexcept ing rod pivotally connected with said piston when the piston isin its extreme upper posifor actuating it, a crank for actuatin said 45tion, as shown in Fig. 1, and the port for the connecting rod, and afluid-tight oran r case connecting passage 9 is so positioned that itfor-said crank, the effective length of said is closed by the pistonexcept that when the cylinder being substantially twice the lengthpiston is in its extreme lower position, as of the crank throw and theeifective length shown in Fig. 2. of said piston being substantiallyone-half 59 With this construction, when a piston is the effectivelength of the cylinder, said cylinder' heving inlet and outlet portsfor'the space at the outer end of the cylinder, and having an inlet portjust closed by the outeredge of the piston when the piston is inits-inner position and another port just closed' by the inner edge ofthe piston when the piston is in its outer position, a conduit afiordingcommunication between the crank case and said last port, and a manifoldfor supplying both said inlet ports.

In witness whereof, I have hereunto subscribed my name.

ADIEL Y. DODGE.

